%0 Journal Article %A V. V. Pukhnachov %T Von Mises variables for problems with a free boundary for the Navier--Stokes equations %J Doklady Akademii Nauk %D 1973 %P 298-301 %V 210 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1973_210_2_a12/ %G ru %F DAN_1973_210_2_a12